What’s your favorite “programmer ignorance” pet peeve?

Question

What are, in your opinion, the worst subjects of widespread ignorance amongst programmers, i.e. things that everyone who aspires to be a professional should know and take seriously, but doesn't?

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Answer 1

he lack of desire to continually improve. I've seen a lot of developers get to a certain level of skill and then just stop learning new things. No reading of blogs, journals, books; it's like they reached a certain skill level and went "yep, I know all I need to know now"